gh-102304: Fix Non-Debug Builds (gh-102846)

Some debug-only code slipped in with gh-102543.

https://github.com/python/cpython/issues/102304

Python/pystate.c

@@ -482,8 +482,10 @@ _PyRuntimeState_Init(_PyRuntimeState *runtime)
 void
 _PyRuntimeState_Fini(_PyRuntimeState *runtime)
 {
+#ifdef Py_REF_DEBUG
     /* The reftotal is cleared by _Py_FinalizeRefTotal(). */
     assert(runtime->object_state.reftotal == 0);
+#endif
 
     if (gilstate_tss_initialized(runtime)) {
         gilstate_tss_fini(runtime);